A remote control system for oil-air lubrication of a finishing mill based on a plc

Abstract

The utility model relates to the control technical field of finishing mill, especially based on the finishing mill oil gas lubrication remote control system of plc, including finishing mill host computer, finishing mill main station PLC, finishing mill drive side remote station PLC, finishing mill oil gas lubrication station PLC, detection switch, local button, finishing mill oil gas lubrication station main pump motor, finishing mill oil gas lubrication station oil gas delivery pipeline, oil tank, control valve and heating rod, the finishing mill host computer is connected to finishing mill main station PLC through communication line, finishing mill main station PLC is connected to finishing mill drive side remote station PLC through communication line, finishing mill drive side remote station PLC is connected to finishing mill oil gas lubrication station PLC through communication line, realized the remote start -stop function of finishing mill oil gas lubrication station and the monitoring display function of finishing mill oil gas station operating state, ensure the premise of effective lubrication of roll to save manpower and material resources to the maximum extent, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of finishing mill control technology, and in particular to a PLC-based remote control system for oil and gas lubrication of finishing mills. Background Technology

[0002] The function of the finishing mill oil-gas station in a steel rolling production line is to continuously blow lubricating oil droplets into the bearing housings of the finishing mill rolls using compressed air. This forms a uniform oil film within the bearing housings, maintaining the necessary lubrication conditions for the high-speed operation of the finishing mill rolls during production. The continuous blowing of compressed air into the bearing housings also helps to cool the rolls. The finishing mill oil-gas lubrication station ensures the service life of the finishing mill rolls and guarantees stable production operation. The oil circulation system uses two oil pumps, one in operation and one on standby, while the air circulation uses solenoid valves to control the compressed air injection. In the previous control mode, the finishing mill oil-gas station used local start-stop and operation status display. When rolling, the finishing mill operator needed to manually start and stop the oil-gas station on-site, and then return to the finishing mill control panel to start and stop the finishing mill after ensuring the oil-gas station was running. This ensured stable operation of the rolls under the protection of the oil-gas station. When rolling stopped, the operator needed to return to the site to start and stop the oil-gas station again, avoiding unnecessary waste, saving energy, and extending the service life of the equipment. However, this working mode leads to personnel frequently traveling back and forth between the site and the control panel, which disrupts the rhythm of steel rolling. In some cases, the oil and gas lubrication station may not be started before the machine is switched on due to negligence, which has extremely serious consequences. Utility Model Content

[0003] This utility model provides a PLC-based remote control system for oil and gas lubrication of finishing mills, which realizes the remote start and stop function of finishing mill oil and gas lubrication station and the monitoring and display function of the operating status of finishing mill oil and gas station, so as to save manpower and material resources to the greatest extent and improve production efficiency while ensuring effective lubrication of rolls.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A PLC-based remote control system for oil and gas lubrication of a finishing mill includes a finishing mill host computer, a finishing mill main station PLC, a finishing mill drive-side remote station PLC, a finishing mill oil and gas lubrication station PLC, detection switches, local buttons, a main pump motor for the finishing mill oil and gas lubrication station, an oil and gas delivery pipeline for the finishing mill oil and gas lubrication station, an oil tank, control valves, and heating rods. The finishing mill host computer is connected to the finishing mill main station PLC via a communication line. The finishing mill main station PLC is connected to the finishing mill drive-side remote station PLC via a communication line. The finishing mill drive-side remote station PLC is connected to the finishing mill oil and gas lubrication station PLC via a communication line. The heating rods are installed inside the oil tank, and the control lines of the heating rods are connected to the output terminals of the finishing mill oil and gas lubrication station PLC. The control valve is located at the inlet of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station, and the detection switch is located at the outlet of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station. The detection switch is connected to the input terminal of the remote station PLC on the finishing mill drive side. The remote output terminal of the remote station PLC on the finishing mill drive side is connected to the remote input terminal of the finishing mill oil and gas lubrication station PLC. The system status output terminal of the finishing mill oil and gas lubrication station PLC is connected to the system status input terminal of the remote station PLC on the finishing mill drive side. The local button is connected to the input terminal of the finishing mill oil and gas lubrication station PLC. The output terminal of the finishing mill oil and gas lubrication station PLC is connected to the main pump motor and the control valve of the finishing mill oil and gas lubrication station respectively.

[0005] Furthermore, the PLC for the finishing mill oil-gas lubrication station includes a power supply module, a CPU module, relays, a digital input module, and a digital output module. The power supply module supplies power to the CPU module. The local button is connected to the digital input module. The digital output module is connected to the system status input terminal of the finishing mill drive-side remote station PLC, the start / stop control terminal of the main pump motor of the finishing mill oil-gas lubrication station, and the control valve respectively through relays.

[0006] Furthermore, the remote station PLC for the finishing mill drive side includes a power supply module, a CPU module, a digital input module, a digital output module, and a relay. The power supply module supplies power to the CPU module. The digital input module is connected to a detection switch. The digital input module is connected to the system status output terminal of the finishing mill oil-gas lubrication station PLC via a relay. The output terminal of the digital output module is connected to the remote input terminal of the finishing mill oil-gas lubrication station PLC via a relay.

[0007] Furthermore, it also includes a pressure detection sensor, which is installed on the air inlet pipe of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station, and the pressure detection sensor is connected to the input terminal of the digital input module of the finishing mill oil and gas lubrication station PLC.

[0008] Furthermore, the detection switch includes a flow switch and a pressure switch, both of which are installed at the pipeline outlet of the oil and gas conveying pipeline of the finishing mill oil and gas lubrication station.

[0009] Furthermore, it also includes a temperature controller, a magnetic float level gauge, a differential pressure sensor, and an oil tank pressure sensor. The temperature control pin of the temperature controller is connected to the control line of the heating rod, and both the heating signal terminal and the alarm signal terminal of the temperature controller are connected to the digital input module input terminal of the PLC of the finishing mill oil-gas lubrication station. The magnetic float level gauge is installed in the oil tank to detect the oil level, the differential pressure sensor is installed at the oil pump outlet of the finishing mill oil-gas lubrication station, and the oil tank pressure sensor is installed in the oil tank outlet pipeline. The magnetic float level gauge, differential pressure sensor, and oil tank pressure sensor are all connected to the digital input module input terminal of the PLC of the finishing mill oil-gas lubrication station.

[0010] Furthermore, the control valve includes a main air valve, branch air valves, and branch oil valves. The main air valve is installed on the main air inlet pipe of the oil-gas delivery pipeline of the finishing mill oil-gas lubrication station. The branch air valves are installed on the branch air inlet pipes after the main air inlet pipe of the finishing mill oil-gas lubrication station oil-gas delivery pipeline. The branch oil valves are installed on the branch pipes of the oil-gas mixing pipeline of the finishing mill oil-gas lubrication station oil-gas delivery pipeline. Compared with the prior art, the beneficial effects of this utility model are: 1) Flow switches, pressure switches and air pressure detection sensors are used to monitor the oil and gas delivery pipeline and air intake pipeline of the finishing mill oil and gas lubrication station in real time, so as to realize the real-time monitoring of the oil and gas delivery status of the finishing mill oil and gas lubrication station and make the closed-loop control of the finishing mill oil and gas lubrication station more accurate. 2) By remotely controlling the start and stop of the oil and gas lubrication station of the finishing mill and monitoring its operation, manpower can be saved to the greatest extent. There is no need to go back and forth between the control panel and the lubrication station to control the start and stop. It can also ensure the use of oil and gas lubrication in real time and ensure the lubrication effect of the roll bearing housing. 3) By setting up a temperature controller, heating rod, magnetic float level gauge, differential pressure sensor and oil tank pressure sensor, the temperature of the oil tank can be controlled and monitored in real time to ensure the stable operation of the oil tank, thereby ensuring the stable operation of the oil and gas lubrication station of the finishing mill. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a wiring diagram of the digital input module AI1 of the remote station PLC for the precision rolling transmission side described in this utility model.

[0013] Figure 3 This is a wiring diagram of the digital output module AO1 of the remote station PLC for the precision rolling transmission side described in this utility model.

[0014] Figure 4 This is a wiring diagram of the PLC auxiliary electrical components for the remote station on the precision rolling transmission side of this utility model.

[0015] Figure 5 This is a wiring diagram of the temperature controller described in this utility model.

[0016] Figure 6 This is a wiring diagram of the digital input module AI01 of the PLC for the precision mill oil-gas lubrication station described in this utility model.

[0017] Figure 7 This is a wiring diagram of the digital input module AI02 of the PLC for the precision mill oil and gas lubrication station described in this utility model.

[0018] Figure 8 This is a wiring diagram of the digital output module AO01 of the PLC for the precision rolling oil and gas lubrication station described in this utility model. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings: See Figure 1 This is a schematic diagram of the structure of this utility model. This utility model discloses a PLC-based remote control system for the oil-air lubrication of a finishing mill, including a finishing mill host computer, a finishing mill main station PLC, a finishing mill drive-side remote station PLC, a finishing mill oil-air lubrication station PLC, detection switches, local buttons, a main pump motor for the finishing mill oil-air lubrication station, oil-air delivery pipelines for the finishing mill oil-air lubrication station, an oil tank, a pressure detection sensor, control valves, heating rods, a temperature controller, a magnetic float level gauge, a differential pressure sensor, and an oil tank pressure sensor. The finishing mill host computer is connected to the finishing mill main station PLC via a communication line, the finishing mill main station PLC is connected to the finishing mill drive-side remote station PLC via a communication line, and the finishing mill drive-side remote station PLC is connected to the finishing mill oil-air lubrication station PLC via a communication line. See Figure 2-3 The remote station PLC for the finishing mill drive side includes a power supply module, a CPU module, a digital input module, a digital output module, and relays. The power supply module supplies power to the CPU module. In this embodiment, there are 11 finishing mill roll bearing seats, therefore, there are 11 oil and gas delivery pipelines between the oil and gas lubrication station and the finishing mill roll bearing seats. The detection switches include flow switches and pressure switches. Flow switches and pressure switches are installed at the outlets of the oil and gas delivery pipelines of the finishing mill oil and gas lubrication station to detect the flow rate and pressure of the oil and gas delivered by the oil and gas delivery pipelines of the finishing mill oil and gas lubrication station, respectively. The digital input modules AI1 of the remote station PLC for the finishing mill drive side are I164.0-I164.7 and I166.0-I... Terminals 166.7 and I167.0-I167.5 are connected to the flow switches and pressure switches of the oil and gas delivery pipelines of the 11 finishing mill oil and gas lubrication stations. I165.0 and I165.3 of the finishing mill drive-side remote station PLC digital input module AI1 are connected to the normally open contacts of relays KA3 and KA6, respectively. I65.1 and I165.2 of the finishing mill drive-side remote station PLC digital input module AI1 are connected to the normally closed contacts of relays KA4 and KA5, respectively. Q172.0 and Q172.1 of the finishing mill drive-side remote station PLC digital output module AO1 are connected to the coils of relays KA7 and KA8, which are used to control the remote start, stop and reset of the oil and gas lubrication station.

[0020] The control valve includes a main air valve, branch air valves, and branch oil valves. The main air valve is installed on the main air inlet pipe of the oil-gas delivery pipeline of the finishing mill oil-gas lubrication station. The branch air valves are installed on the branch air inlet pipes after the main air inlet pipe of the finishing mill oil-gas lubrication station oil-gas delivery pipeline. The branch oil valves are installed on the branch pipes of the oil-gas mixing pipeline of the finishing mill oil-gas lubrication station oil-gas delivery pipeline. The heating rod is installed in the oil tank. The air pressure sensor is installed on the air inlet pipe of the finishing mill oil-gas lubrication station oil-gas delivery pipeline. The magnetic float level gauge is installed in the oil tank to detect the oil tank level. The differential pressure sensor is installed at the oil pump outlet of the finishing mill oil-gas lubrication station. The oil tank pressure sensor is installed on the oil tank outlet pipeline. See Figure 4-7 The PLC for the finishing mill oil-gas lubrication station includes a power supply module, a CPU module, relays, digital input modules AI01-AI02, and digital output modules AO01-AO04. The power supply module powers the CPU module. The finishing mill oil-gas lubrication station has two main pump motors, which can be used as one power supply and one backup, or both simultaneously. I0.0-I0.1 of the digital input module AI01 are connected to magnetic float level gauges S1 and S2, respectively, to detect the set low and ultra-low limits of the oil tank level. I0.2-I0.3 of the digital input module AI01 are connected to differential pressure sensors S3 and S4, respectively, to detect whether the filter at the oil pump outlet corresponding to the main pump motor of the finishing mill oil-gas lubrication station is blocked. I0.4 of the digital input module AI01 is connected to pressure sensor S5, to detect the pressure in the oil tank outlet pipeline. I0.5-I0.6 are connected to the temperature alarm and heater heating terminals of the temperature controller. I0.7 of the digital input module AI01 is connected to the normally open contact of relay KA1. The coil of relay KA1 is connected in series with relay KA7. The power terminals of the temperature controller are connected to the corresponding external power supply. The signal line is connected to the heating rod, and the control line is connected to I0.5-I0.6 of the digital input module AI01. The local buttons SB0, SB1, and SB2 are connected to the I1.1-I1.4 terminals of the digital input module AI02, which are used to control the selection of local and remote modes and the local start and stop, respectively. I1.0 of the digital input module AI02 is connected to the normally open contact of relay KA2. The coil of relay KA2 is connected in series with relay KA8. I1.5 of the digital input module AI02 is connected to the air pressure detection sensor.

[0021] See Figure 8The output terminals Q0.0-Q0.3 of the digital output module AO01 are connected to the coils of relays KA3-KA6. The output terminals Q0.4-Q0.5 of the digital output module AO01 are connected to the coils of relays KA21 and KA22. The normally open contacts of relays KA21 and KA22 are electrically connected to the control circuit of the main pump motor of the oil rolling gas lubrication station to trigger the starting circuit of the corresponding main pump motor of the oil rolling gas lubrication station. The output terminal Q0.7 of the digital output module AO01 is electrically connected to relay KA24 to control the main air valve switch. The output terminals of digital output modules AO02-AO04 are electrically connected to the branch air valves and branch oil valves of 11 pipelines through relays to control the switches of the branch air valves and branch oil valves on the 11 pipelines respectively.

[0022] Working principle: The host computer of the finishing mill inputs control parameters to the finishing mill master station PLC. The finishing mill master station PLC sends control signals to the finishing mill drive side remote station PLC. The finishing mill drive side remote station PLC sends control signals to the finishing mill oil and gas lubrication station PLC. The finishing mill oil and gas lubrication station PLC sends the lubrication station's operation indication, alarm indication, fault indication, and remote mode indication back to the finishing mill drive side remote station PLC. The finishing mill drive side remote station PLC feeds these status signals back to the finishing mill host computer for display through the finishing mill master station PLC. The system monitors the 11 pipelines for blockages in real time using flow and pressure switches. Temperature control is used to control the heating rods to heat the oil tank. When local mode is selected, the finishing mill oil-gas lubrication station is controlled via a local button. When remote mode is selected, the finishing mill host computer selects remote mode, and the remote station PLC on the finishing mill drive side sends remote start / stop and remote reset signals to the input terminal of the finishing mill oil-gas lubrication station PLC. The finishing mill oil-gas lubrication station PLC then controls the opening and closing of the main air valve, the air valves of the 11 pipelines, and the oil valves, thereby controlling the finishing mill oil-gas lubrication station.

[0023] The oil level is monitored by a magnetic float level gauge inside the oil tank to prevent it from getting too low. A differential pressure sensor is used to check if the oil pump outlet pressure is below a threshold. If it is below the threshold, it indicates that the oil pump outlet filter is clogged and needs to be addressed. If the oil tank pressure sensor detects that the pressure is below the threshold, it indicates that there is a problem with the oil supply to the tank and that troubleshooting and maintenance are required.

[0024] The above embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A PLC-based remote control system for oil-air lubrication of a finishing mill, characterized in that, The system includes a finishing mill host computer, a finishing mill main station PLC, a finishing mill drive-side remote station PLC, a finishing mill oil-gas lubrication station PLC, detection switches, local buttons, a finishing mill oil-gas lubrication station main pump motor, a finishing mill oil-gas lubrication station oil-gas delivery pipeline, an oil tank, control valves, and heating rods. The finishing mill host computer is connected to the finishing mill main station PLC via a communication line. The finishing mill main station PLC is connected to the finishing mill drive-side remote station PLC via a communication line. The finishing mill drive-side remote station PLC is connected to the finishing mill oil-gas lubrication station PLC via a communication line. The heating rods are installed inside the oil tank, and the control lines of the heating rods are connected to the output terminals of the finishing mill oil-gas lubrication station PLC. The control valve is located at the inlet of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station, and the detection switch is located at the outlet of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station. The detection switch is connected to the input terminal of the remote station PLC on the finishing mill drive side. The remote output terminal of the remote station PLC on the finishing mill drive side is connected to the remote input terminal of the finishing mill oil and gas lubrication station PLC. The system status output terminal of the finishing mill oil and gas lubrication station PLC is connected to the system status input terminal of the remote station PLC on the finishing mill drive side. The local button is connected to the input terminal of the finishing mill oil and gas lubrication station PLC. The output terminal of the finishing mill oil and gas lubrication station PLC is connected to the main pump motor and the control valve of the finishing mill oil and gas lubrication station respectively.

2. The remote control system for oil and gas lubrication of a finishing mill based on PLC according to claim 1, characterized in that, The PLC for the finishing mill oil-gas lubrication station includes a power supply module, a CPU module, relays, a digital input module, and a digital output module. The power supply module supplies power to the CPU module. The local button is connected to the digital input module. The digital output module is connected to the system status input terminal of the finishing mill drive-side remote station PLC, the start / stop control terminal of the main pump motor of the finishing mill oil-gas lubrication station, and the control valve through relays.

3. The PLC-based remote control system for oil and gas lubrication of a finishing mill according to claim 1, characterized in that, The remote station PLC for the finishing mill drive side includes a power supply module, a CPU module, a digital input module, a digital output module, and a relay. The power supply module supplies power to the CPU module. The digital input module is connected to a detection switch. The digital input module is connected to the system status output terminal of the finishing mill oil-gas lubrication station PLC through a relay. The output terminal of the digital output module is connected to the remote input terminal of the finishing mill oil-gas lubrication station PLC through a relay.

4. The remote control system for oil and gas lubrication of a finishing mill based on PLC according to claim 2, characterized in that, It also includes a pressure detection sensor, which is installed on the air inlet pipe of the oil and gas delivery pipeline of the finishing mill oil and gas lubrication station, and the pressure detection sensor is connected to the input terminal of the digital input module of the finishing mill oil and gas lubrication station PLC.

5. A PLC-based remote control system for oil and gas lubrication of a finishing mill according to claim 1, characterized in that, The detection switch includes a flow switch and a pressure switch, both of which are installed at the pipeline outlet of the oil and gas conveying pipeline of the finishing mill oil and gas lubrication station.

6. A PLC-based remote control system for oil and gas lubrication of a finishing mill according to claim 2, characterized in that, It also includes a temperature controller, a magnetic float level gauge, a differential pressure sensor, and an oil tank pressure sensor. The temperature control pin of the temperature controller is connected to the control line of the heating rod. The heating signal terminal and alarm signal terminal of the temperature controller are both connected to the digital input module input terminal of the PLC of the finishing mill oil-gas lubrication station. The magnetic float level gauge is installed in the oil tank to detect the oil level. The differential pressure sensor is installed at the oil pump outlet of the finishing mill oil-gas lubrication station. The oil tank pressure sensor is installed in the oil tank outlet pipeline. The magnetic float level gauge, differential pressure sensor, and oil tank pressure sensor are all connected to the digital input module input terminal of the PLC of the finishing mill oil-gas lubrication station.

7. A remote control system for oil and gas lubrication of a finishing mill based on a PLC according to claim 2, characterized in that, The control valve includes a main air valve, branch air valves, and branch oil valves. The main air valve is installed on the main air inlet pipe of the oil and gas conveying pipeline of the finishing mill oil and gas lubrication station. The branch air valves are installed on the branch air inlet pipes after the main air inlet pipe of the finishing mill oil and gas lubrication station oil and gas conveying pipeline. The branch oil valves are installed on the branch pipes of the oil and gas mixing pipeline of the finishing mill oil and gas lubrication station oil and gas conveying pipeline.

Images